(2a+3b)(2a-3b)+(a-3b)^2
=4a^2-9b^2+(a-3b)^2
=4a^2+[(a-3b)^2-9b^2]
=4a^2+a(a-6b)
=4a^2+a^2-6ab
=5a^2-6ab
=a(5a-6b)
a=5,b=-1/3
a(5a-6b)=5*(25+2)=135
(2a+3b)(2a-3b)+(a-3b)^2
=4a^2-9b^2+(a-3b)^2
=4a^2+[(a-3b)^2-9b^2]
=4a^2+a(a-6b)
=4a^2+a^2-6ab
=5a^2-6ab
=a(5a-6b)
a=5,b=-1/3
a(5a-6b)=5*(25+2)=135